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| Study on the Performance of Vanadium Catalyst on Folded Glass Fiber Substrates |
| DOI：10.13949/j.cnki.nrjgc.2022.05.001 |
| Key Words:substrate vanadium catalyst ammonia nitrogen ratio NOx space velocity NH3 slip |
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| Abstract:According to the mechanism of NH3–selective catalytic reduction（SCR）， the application performance of vanadium catalyst with folded glass fiber substrate in heavy diesel engine was simulated and compared with that of vanadium catalyst with traditional cordierite. The simulation program was verified by the test results of China Ⅵ engine test bench. Then the effects of ammonia nitrogen ratio， NO2/NOx ratio and space velocity on NOx conversion and NH3 slip characteristics at low temperature were studied. The results show that the NOx conversion performance of vanadium catalyst with folded glass fiber is better than that of vanadium catalyst with cordierite under the same conditions at low temperature. The increase of ammonia nitrogen ratio has no significant effect on the NOx reduction performance of vanadium catalyst with folded glass fiber at low temperature. When the ammonia nitrogen ratio increases from 0.8 to 1.2， the slip of NH3 increases from 1×10-6 to 100×10-6 in the range of 200 ℃~500 ℃. At the temperature of 150 ℃， NO2/NOx ratio increases from 0 to 0.5， the NOx conversion efficiency of vanadium catalyst with folded glass fiber increases from 14.0% to 76.0%， and NH3 slip decreases from 428×10-6 to 9×10-6. At 200 ℃， the NOx conversion efficiency of vanadium catalyst with folded glass fiber is 98.5% at 30 000 h-1 space speed， which is nearly 30.0% higher than that at 90 000 h-1. And the NH3 slip is 7×10-6， which is 150×10-6 lower than that at 90 000 h-1. |
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